Chemically Modified Coconut Shell Biochar for Removal of Heavy Metals from Aqueous Solution

Abstract:

In this study, coconut shells were converted into biochar via pyrolysis and chemically modified via an acid-base treatment to enrich its adsorption capabilities. Batch experiments were carried out to analyze the adsorption potential of the modified coconut shell (MCSC) or removal of chromium, nickel, and copper from aqueous solution. The chemical modification increased the surface area of MCSC to 185.712 m²/g. Batch adsorption study using MCSC resulted in 99% removal of copper, 95% (nickel), and 39% (chromium). The adsorption of studied metal ions fitted well with Langmuir isotherm, showing a monolayer adsorption process. A kinetic analysis showed that all the samples match a strong correlation coefficient in pseudo-second-order (R²>0.95), indicating the occurrence of a chemical adsorption process.

• Periodical: Defect and Diffusion Forum (Volume 411)
• Pages: 79-91
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.411.79
• Online since: September 2021
• Authors: Muhammad Imran-Shaukat, Nur Rafikah binti Rosli, Rafeah Wahi*, Sharifah Mona Abd Aziz Abdullah, Zainab Ngaini
• Keywords: Adsorption, Biochar, Chemical Modification, Toxic Heavy Metals, Wastewater Treatment

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